Add diagram workbench UI with Modelica DoF coaching and ISO glyphs.

Ship the Next.js cycle editor with CAD chrome, technical HX symbols, Fixed/Free boundary guidance, and secondary water/air pressure drop support in the solver stack.

Co-authored-by: Cursor <cursoragent@cursor.com>

crates/cli/examples/heatpump_airsource_r410a.json

@@ -0,0 +1,93 @@
+{
+  "name": "Air-Source Heat Pump R410A (4-Port Modelica Style)",
+  "description": "Heat pump cycle: evaporator absorbs heat from outside air (AirSource → evap:secondary_inlet → evap:secondary_outlet → AirSink), condenser delivers heat to a hot-water loop (BrineSource → cond:secondary_inlet → cond:secondary_outlet → BrineSink). Both secondary sides are real graph edges. Uses emergent-pressure mode for genuine ε-NTU coupling.",
+
+  "fluid": "R410A",
+  "fluid_backend": "CoolProp",
+
+  "circuits": [
+    {
+      "id": 0,
+      "name": "Heat pump refrigerant + secondary loops",
+      "components": [
+        {
+          "type": "IsentropicCompressor",
+          "name": "comp",
+          "isentropic_efficiency": 0.70,
+          "t_cond_k": 323.15,
+          "t_evap_k": 265.15,
+          "superheat_k": 5.0,
+          "emergent_pressure": true,
+          "displacement_m3": 5.0e-5,
+          "speed_hz": 50.0,
+          "volumetric_efficiency": 0.90
+        },
+        {
+          "type": "Condenser",
+          "name": "cond",
+          "ua": 2000.0,
+          "emergent_pressure": true,
+          "subcooling_k": 5.0,
+          "secondary_fluid": "Water"
+        },
+        {
+          "type": "IsenthalpicExpansionValve",
+          "name": "exv",
+          "t_evap_k": 265.15,
+          "emergent_pressure": true
+        },
+        {
+          "type": "Evaporator",
+          "name": "evap",
+          "ua": 1800.0,
+          "emergent_pressure": true,
+          "secondary_fluid": "Air",
+          "secondary_humidity_ratio": 0.005
+        },
+        {
+          "type": "BrineSource",
+          "name": "cond_water_in",
+          "fluid": "Water",
+          "p_set_bar": 2.5,
+          "t_set_c": 40.0,
+          "m_flow_kg_s": 0.40
+        },
+        {
+          "type": "BrineSink",
+          "name": "cond_water_out",
+          "fluid": "Water",
+          "p_back_bar": 2.5
+        },
+        {
+          "type": "AirSource",
+          "name": "evap_air_in",
+          "p_set_bar": 1.01325,
+          "t_dry_c": 7.0,
+          "rh": 80.0,
+          "m_flow_kg_s": 1.0
+        },
+        {
+          "type": "AirSink",
+          "name": "evap_air_out",
+          "p_back_bar": 1.01325
+        }
+      ],
+      "edges": [
+        { "from": "comp:outlet", "to": "cond:inlet" },
+        { "from": "cond:outlet", "to": "exv:inlet" },
+        { "from": "exv:outlet", "to": "evap:inlet" },
+        { "from": "evap:outlet", "to": "comp:inlet" },
+        { "from": "cond_water_in:outlet", "to": "cond:secondary_inlet" },
+        { "from": "cond:secondary_outlet", "to": "cond_water_out:inlet" },
+        { "from": "evap_air_in:outlet", "to": "evap:secondary_inlet" },
+        { "from": "evap:secondary_outlet", "to": "evap_air_out:inlet" }
+      ]
+    }
+  ],
+
+  "solver": {
+    "strategy": "fallback",
+    "max_iterations": 300,
+    "tolerance": 1e-6
+  }
+}